The document summarizes key aspects of aqueous humour, including its functions, physicochemical properties, factors affecting its composition and outflow, and role in maintaining intraocular pressure. Aqueous humour is a clear fluid continuously circulated in the eye that maintains intraocular pressure and shape. It is produced by the ciliary epithelium and exits through trabecular and uveoscleral outflow pathways. The blood-aqueous barrier prevents plasma proteins from entering the aqueous, and its breakdown allows plasma contents to pass into the aqueous.